Fair enough and I'm not suggesting we only speak in givens or certainties, but I also think the nature of transfers and new players in new leagues and new managers inherently implies uncertainty, even if those players have a history of success elsewhere and the manager has also succeeded in the past. Van Gaal was a successful manager with a proven track record. That ended up going horribly wrong. Are Mourinho and Van Gaal the same? Of course not, but they both have a failed tenure in their recent past. Di Maria is a fantastic player and was a huge signing for you. That also went south pretty quickly. Zlatan and Mhhitaryan are fantastic players and would seem to be sure things to succeed at United. But recent history tells us that fantastic players have come here and failed miserably.Nothing is a given. There'd be no point discussing anything if we could only speak about "givens". Mourinho may fail, but I don't believe that for a moment. Can you objectively look at our current team, and our general state as a club, and say that there aren't obvious signs that we are moving forward? You cannot also disregard Mourinho's brilliance. I'm not saying we exclude his Chelsea debacle, it's obviously relevant and worth consideration, but it's outside his norm.
We've signed* three world class players (arguably), and in Bailly, a hugely promising youngster to go with our existing youth talents. Clearly the club still has massive pull. So yes, anything is "possible", but we obviously have to weigh up the likelihood of our predictions. I'm rambling on now but essentially my point is that United are showing clear signs of improvement.
*Pogba obviously hasn't signed but it looks a certainty now.
Again, I'm not saying that's what's going to happen. In fact, I believe it's more likely everything works out and the season is a success. But when you talk about being on a "clear upward trajectory" there needs to be more evidence than just new signings and a new manager, especially when you consider United's recent history with splashy signings and new big name managers. What's that phrase about forgetting history and then having it repeat itself?? That's all I'm saying. Optimism is perfectly fine, but given recent events like those I've referenced isn't it better if it were cautious optimism? For the record I feel the same way about Spurs.